feat(ModularBot): anti-surfer gun + wave-surf movement module

- Anti-surfer gun: inverse GF targeting for wave-surfing enemies
- Wave-surf movement: danger histogram dodge (not wired yet, needs movement selector)
- 7 guns total, battle-tested

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ModularBot_garage/tests/test_gauntlet.nim

@@ -0,0 +1,35 @@
+## Gauntlet: ModularBot vs WaveSurfer, SpinBot, Crazy — 10 rounds each.
+## Captures [gun] lines and scores. Run with:
+##   nim c -r --path:../../common_libs tests/test_gauntlet.nim
+
+import std/[os, strformat]
+import test_framework/test_framework
+
+const
+  modularBotDir  = currentSourcePath().parentDir.parentDir
+  samplesDir     = "/home/davide/Downloads/robocode-tankroyale/sample-bots-nim-linux-1.0.7"
+  waveSurferDir  = "/home/davide/Projects/SirRoboGarage/WaveSurfer_garage"
+  spinBotDir     = samplesDir / "SpinBot"
+  crazyDir       = samplesDir / "Crazy"
+
+if not fileExists("/home/davide/Projects/tank-royale/server/build/libs/robocode-tankroyale-server-0.35.5-all.jar") or
+   not fileExists("/home/davide/Projects/tank-royale/runner/examples/lib/robocode-tankroyale-runner.jar"):
+  echo "Skipping: Tank Royale JARs not found"
+  quit(0)
+
+proc runAndReport(label, enemyName, enemyDir: string) =
+  echo fmt"\n=== {label} ==="
+  let r = runBattle(@[modularBotDir, enemyDir], rounds = 10, timeout = 240000)
+  var mbScore = 0
+  var enScore = 0
+  for b in r.results:
+    if b.name == "ModularBot": mbScore = b.totalScore
+    if b.name == enemyName:    enScore = b.totalScore
+  let winner = if mbScore > enScore: "ModularBot" else: enemyName
+  echo fmt"  ModularBot: {mbScore}  {enemyName}: {enScore}  → {winner} wins"
+  echo fmt"  Rounds: {r.rounds.len}"
+
+runAndReport("Battle 1/3: vs WaveSurfer", "WaveSurfer", waveSurferDir)
+runAndReport("Battle 2/3: vs SpinBot",    "SpinBot",    spinBotDir)
+runAndReport("Battle 3/3: vs Crazy",      "Crazy",      crazyDir)
+echo "\nGauntlet complete."